a {
    text-decoration: none;
    display: inline-block;
    padding: 8px 16px;
    position: absolute;
}

a:hover {
    background-color: #639bed;
    color: black;
}

.previous {
    background-color: #f1f1f1;
    color: black;
}

.next {
    background-color: #4CAF50;
    color: white;
}

.round {
    /* border-radius: 50%; */
}